Electromagnets - AQA

1

What will increase the strength of the magnetic field around a current?

2

What is the effect of putting an iron core inside a solenoid?

3

An electric current flows through a wire. What happens to the magnetic field strength when the wire is shaped into a solenoid?

4

What do a bar magnet and a solenoid have in common?

5

Which of the following does not increase the strength of the magnetic field produced by an electromagnet?

6

When using Fleming's left hand rule, what does the thumb represent? - Higher

7

0.4 A flows in 0.1 m of wire in a 0.7 T magnetic field. What force acts on the wire?

8

In a dc motor, what is the function of the split ring commutator?

9

How do headphones generate sounds?

10

What are the main components in a loudspeaker?